Preparation method for CdHgTe/CdS core-shell quantum dot

A technology of core-shell quantum dots and preparation steps, which is applied in the field of synthesis of fluorescent nanomaterials, can solve the problems of complex operation process, high condition requirements, and CdHgTe/CdS quantum dots do not have hydrophilicity, so as to simplify the synthesis process and source Rich, easy-to-control process parameters

Active Publication Date: 2015-09-23
湖北荆楚理工资产经营管理有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The CdHgTe / CdS quantum dots synthesized in the organic phase are not hydrophilic, and must be exchanged into the water phase through ligand exchange before being applied to the biological system. The operation process is complicated and the conditions are high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Below by embodiment, further illustrate outstanding feature of the present invention, only in order to illustrate the present invention and in no way limit the present invention.

[0023] A CdHgTe / CdS core-shell quantum dot, which consists of: tellurium powder (Te), cadmium chloride (CdCl 2 2.5H 2 O), mercury chloride (HgCl 2 ), thioglycolic acid (TGA), and the rest are aqueous solutions.

[0024] In the described CdHgTe / CdS core-shell quantum dots, tellurium powder (Te), cadmium chloride (CdCl 2 2.5H 2 O), mercury chloride (HgCl 2 ), thioglycolic acid (TGA) at a molar ratio of 0.5:1:0.03:2.5, in a water bath at 40°C, and irradiated with a 254 nm UV lamp at 30 W for 48 h.

[0025] The pH of the solution is 11.2.

[0026] A kind of illumination and water bath synchronous preparation method of CdHgTe / CdS core-shell quantum dots, its steps are:

[0027] 1. Prepare potassium tellurium hydride solution by reducing tellurium powder with potassium borohydride: weigh 0.5...

Embodiment 2

[0035] A CdHgTe / CdS core-shell quantum dot, which consists of: tellurium powder (Te), cadmium chloride (CdCl 2 2.5H 2 O), mercury chloride (HgCl 2 ), thioglycolic acid (TGA), and the rest are aqueous solutions.

[0036] In the CdHgTe / CdS core-shell quantum dots, tellurium powder (Te), cadmium chloride (CdCl 2 2.5H 2 O), mercury chloride (HgCl 2 ), the molar ratio of thioglycolic acid (TGA) was 0.3:1:0.05:2.8, and the water bath was 50°C and 20 W 254 nm UV lamp was irradiated for 60 h.

[0037] The pH of the solution is 12.0.

[0038] A kind of illumination and water bath synchronous preparation method of CdHgTe / CdS core-shell quantum dots, its steps are:

[0039] 1. Prepare potassium tellurium hydride solution by reducing tellurium powder with potassium borohydride: weigh 0.6750 g potassium borohydride and 0.3190 g tellurium powder in a test tube with a soft stopper, add 10 mL deionized water to it, plug the stopper, and React in an ice bath for 10 h to obtain a dark purp...

Embodiment 3

[0047] A kind of illumination and water bath synchronous preparation method of CdHgTe / CdS core-shell quantum dots, its steps are:

[0048] 1. Prepare potassium tellurium hydride solution by reducing tellurium powder with potassium borohydride: weigh 1.350 g potassium borohydride and 0.6380 g tellurium powder in a test tube with a soft stopper, add 10 mL of deionized water to it, plug the stopper, and React in an ice bath for 10 h to obtain a deep purple transparent liquid, which is a 0.50 mol / L potassium selenium hydride solution. The reaction equation is as follows:

[0049] 4KBH 4 + 2Te + 7H 2 O → 2KHTe + K 2 B 4 o 7 +14H 2 ↑;

[0050] 2. Weigh 0.2284 g of cadmium chloride crystals and 0.0272 g of mercury chloride crystals, and dissolve them in 200 mL of deionized water to obtain a mixed solution (cadmium ion concentration is 0.005 mol / L, mercury ion concentration is 5.0×10 -4 mol / L);

[0051] 3. Pipette 0.208 mL of mercaptoacetic acid, add it to the mixed solutio...

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Abstract

The invention provides a preparation method for a CdHgTe / CdS core-shell quantum dot. The preparation method comprises the following steps: A, preparing a potassium tellurium hydride solution which is prepared by reducing tellurium powder through potassium borohydrate; B, weighing a certain proportion of cadmium chloride and mercuric chloride crystal, dissolving the mixture with deionized water, and performing metered volume to obtain a mixed solution of cadmium chloride and mercuric chloride; C, adding quantified thioglycolic acid into the mixed solution; D, adjusting the solution with a potassium hydroxide solution to enable the solution to have a specific pH value; E, after inert gas is introduced for oxygen removal, adding the new prepared potassium tellurium hydride solution; F, irradiating through a UV light, and detecting through fluorescence spectrum analysis; G, adding isopropanol for purification, and drying through a freezer dryer to obtain CdHgTe / CdS core-shell quantum dot solid powder. According to the preparation method, the process is relatively simple; process parameters are easy to control; raw materials are inexpensive, the synthesized quantum dot is small in particle size and relatively uniform in particle size distribution, and the fluorescence quantum yield is relatively high.

Description

technical field [0001] The present invention relates to the synthesis of fluorescent nanomaterials, and more specifically to a method for synchronous preparation of CdHgTe / CdS core-shell quantum dots in aqueous phase illumination and water bath. The synthesized quantum dots have near-infrared fluorescence wavelengths and can be used for biomarkers and in vivo imaging. Background technique [0002] CdHgTe / CdS core-shell quantum dots, as a kind of near-infrared emitting quantum dots, have become a research hotspot due to their higher sensitivity and contrast in the detection of deep tissues and organs, thus promoting the development of real-time fluorescence imaging technology in living animals. The CdHgTe / CdS quantum dots synthesized in the organic phase are not hydrophilic, and must be exchanged into the water phase through ligand exchange before being applied to the biological system. The operation process is complicated and the conditions are high. Quantum dots prepar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/89C09K11/02B82Y20/00
Inventor 詹红菊马雪涛刘明刘善培
Owner 湖北荆楚理工资产经营管理有限公司
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